Boiler-furnace.



G. DE GRAHL.

BOILER FURNAGB. APPLIUATION FILED Nov. '1,y 190s.

965,292. Patented July 26, 1910.

2 SHEETS-SHEET 1.

Figi. 47 U 40 Lg n e( @36656574 CZ@ (rai G. DE GRAHL.

BOILER FURNAGB.

APPLIGATION FILED Nov. 7, 1908.

965,292; Patented July 26, 1910.

GUSTAV DE GBAIIL' OF WILMERSDORF, EAR BERLN, GERMANY.

' BOILER-FUBNACE.

Specification of Letters Patent. p Patented July 26, 1910.

Application ledNovember 7, 1908. Seri-a1 No. 461,515.

To all whom it my concer/n: I

4Be it known that I, GrUs'rAv` DE GRAHL, a subject of the German Em ror, and residing at Wilmersdorf, near erlin, Germany, have inventedcertain new and useful Im` provements in Boiler-Furnaces, of which the following is a specification. a

The subject-matter of the present vinvention isa device .for obtaining smokeless combustion in boiler furnaces. The same en ables secondary. air for combustion to be introduced automatically into the combustion chamber in proportion as the vacuum in the combustion chamber increases, so that the vacuum cannot exceed a definite limit.

The subject-matter of the invention. is represented-by wayof example in the accompanying drawings, namely Figure 1 shows the same lpartly in side elevation and partly in. vertical section. Figs. 2 and 3 are each a vertical' section in the plane A--B in Fig. 1, namely Fig. 2 when the door is bolted and Fig. 3 after-the bolts are released. Fig. 4 shows the device partly in sectional elevation and partly in vertical section when the door is open. Fig. 5 showsA the .valves in tlues arranged later# ally of the furnace-door on an enlarged scale. Figs. 6 and 7 are vertical sections in the planeC-D in Fi .1, and Fi s. 8 and 9 show, partly in side le ovation, 'an partly. in

vertical section, the cataract 1n combination.

with an ejector and the door-shaft.

The shaft 2, with which the furnace-door 1 is rigidly connected is journaled the bearings 8, 9 attached to the door-frame 17. A lever 3 f, rmed as a counterweight and provided with a handle 4 is mounted able to rock on the shaft 2. The sector 5 which has projections 6 4and 62 is attached'on the shaft 2 close to the lever 3. `The shaft 12 is journaled in theA extensionv 10 of the bearing 8 and in the extension 11 of the bearing 9. The bowshaped lever 13 which has the pawl-like shoulder 14 is attached on the shaft 12. The lever 3 is rigidly connected by the part 15 with the nose 16 and is provided with the projection 63.

The-door-frame v17 is provided with the lateral`air-lues 18, 19 which open laterally into the chamber inclosed by the door-frame. The bolts 20, 21 are journaled inthe lines 18, 19. Flap-valves 22, 23` which are each firmly connected with two springs 24, 25

and 26, 27 are attached on said bolts. Thev stop 28 for the Hap-valve 22 is arranged on the interior wall ofthe flue 18, and the stop 29 for' the Hap-valve 23 is arranged on the K interior wall of thel conduit 19.

The cataract-cylinder 30, in which the piston 31 is movable, is attached laterally of the door-frame 17. The part32 of the-pis ton is clasped by a fork 33 which is attached on the shaft` 34. The bushing 35 v around which the double lever 44, 45 can rock,V is attached to the weighted leve 40. The arm 44 is provided with the handl 55 (Fig. 1). The two abutments 46, 47 (Figs. 6 and 7) are provided on the lever 40,' and to the latter is attached the spring 48 which tends to press the lever 44 against the abutment 46 with its end 49. Further, the double lever 53, 54 is pivoted to the lever 40 at 52. Further, there is rigidly connected with the shaft 12 the'lever 50, to which the vpivot 51 is attached. The arm 54 is of such a length that it rocks against the pivot51. The cataract-cylinder 30 is connected above vthrough a p ipe' 56 with an ejector 57.

There` opens into the ejector 57 the steam pipe 58, and in the latter there Ais arranged a s topcock 59 in order to shut oli' steam from the ejector. The cataract-piston 31 can'be sucked up, z'. e. raised, by the ejector Kitlout thelever 3 having to be operated by The device operates as follows: When the furnace-door is shut, as shown in Figs. 1 and 2, in proportion as the vacuum in the fire-box exceeds a definite limit the valves 22, 23 are opened so that air can pass through the llues' 18, 19 into the fire-box. In the closed position the furnace-door 1 lies at 60 on the door-frame and i's prevented from openin by the shoulder 14 of the lever 13 whic lies against the nose 6 of the sector 5. The door is lconsequently locked vand in this position is immovable. When'the door is to be opened for stoking, the weighted lever 3 is moved out of the position according to Fig. 2 into the-position according to Fig. 3. The door is not yet opened, but the rounded nose 160i the lever 3 acts against the lever 13 and rotates the same u ward so that the -shoulder'14 visremoved rom the projection 6, as clearly shown in Fig. 3. The consequence is that `the door is unlocked. Now 1f the lever 3 is rotated into the position shown in Fig. 4, the lever 3 which lies with its projection 63 against the projection 6 of the sector 5 drives the sector so that the latter and with it the shaft 2 is rotated, and consequently the door 1 is opened. With the shaft 2A the weighted lever 40 attached on way into the closedposition, the projection 6 of the sector 5 following the projection 63 of the lever 3. As soon as the projections 41, 42 of the lever 40 hit against the projection 36, 37 of the bushing 35' (Figs. 8 and 9) attached on the shaft 34, the door continues on its way into the closed position in proportion as the gradually descending cataract-pistontallows of this. The lever 13 is released from the nose 16 of the lever 3,

so that the former can descend into its lower osition, in which its shoulder 14 lies in ront of the projection 6 of the sector 5 and the door is locked again, as Fig. 2 clearl shows. Thedoor can also be opened-bythe driver by moving the lever 40. For. this purpose the lever 44 is first moved around the pivot43 against the spring 48 until it lies against-the abutment 47 During this time the lever 40 cannot be rotated because the door is stillv locked. While the lever 44 is on its way to the abutment 47, the lever 53, 54 is `rotated around the 'piv0t 52, so that they lever 54 acts against the 1vot `51 of the lever 50. In this manner t e shaft 12 (Fig. 6) is rotated so farthat the shoulder 14 of the lever 13 is removed from the projection 6 of the sector 5 and the door is unbolted. If the lever 44 is rotated further downward, the lever 40 is driven. Since the latter is rigidly connected with the door-shaft, the latter is rotated a like distance, and the door is opened. The projections 41, 42 of the lever 40 hit against the projections 36, 37 of the bushing 35 attached on the shaft 34, the consequence of which is that thecataract-piston 31 is driven upward into the tensionedposition. The 'furnace-door can also be partially opened by the piston l31 ofthe cataract bein sucked up by .means of the above mentione ejector. 4'The movement of the piston'31 is then transmitted through the lever 33which rocks upward and imparts its motion to the shaft 34 and the bushing 35;' The latter -a locking lever havin acts with its projection 36 against the roller 39 of the lever 38. In this mannerthe shaft 12 is rotated and the lever 13 (Figs. 2 and 3) which is attached to it and which participates in this rotation is raised, so that its shoulder 14 releasesthe projection 6 of the sector 5. Consequently the door is unlocked, as was previously pointed out. As soon as the cataract-piston descends the roller 39 of the lever 38 is released.

What I claim as my invention and desire to secure by Letters Patent is:

1. In means for obtaining smokeless combustion in boiler furnaces, the combination with-a door, a shaft carrying said door, a weighted lever having a nose and a projection revoluble loosely on the doorshaft, a sector having two projections fixed on the door-shaft, a shaft revoluble on the furnace, and a locking lever havinga shoulder fixed on the latter shaft, said shoulder abutting against one projection of the sector when the door is shut, and said nose being adapted to raisethe latter lever and release its shoulder from the sector when the weighted lever is rotated to open the door,the 'other projection of said sector being then driven by the projection of the weighted lever.

2. In means for obtaining smokeless combustion in boiler furnaces, thecombination with a door, a shaft carrying said door, a weighted lever having a nose and a roject1on revoluble loosely on the door-sha t, a

y sector having two projections fixed on the door-shaft, a shaft revoluble on the furnace, a locking lever having a shoulder fixed on the latter shaft, said shoulder abutting against one projection of the sector when the door is shut, and said nose being adapted to raise the latter lever and release its shoulder vfrom the sector when the weighted lever is rotated to open the door, the other projection of said sector being then driven y the projection of theA weighted4 lever, a second weighted lever fixed on the doorshaft, a lever arm attached to said shaft, and levers, substantially as shown, on the latter weighted lever for actuating said lever arm and thereby rotating'its shaft and releasing said sector from the locking lever.

3. In means for obtaining smokeless combustion in boiler furnaces, the combination with a door, a shaft carrying said door, a

weighted lever having a nose and a rojection-revoluble loosely on-the door-s aft, a sector havmg two projections fixed on the door-shaft,'a shaft revoluble on the furnace,"

a shoulder fixed on the latter shaft, said shoulder 'abutting against one projection of the sector when the door is shut, a'cataract-'cylinder containing a piston, a lever arm attached to said shaft, i

ns for impartin the upward moand l ald plston to sai lever arm, as set 4. In means for obtaining smokeless comwith the door, a shaft carrying the door,

vlocking means for locking the door in its closed position, of a shaft carrying a 'lever arm adapted to operate said locking means, a weighted lever on said door-shaft, and 1evers pivoted on said weighted lever for actuating said lever arm.

5. In means for obtaining smokeless combustion in boiler furnaces, the combination, with the door, a shaft carrying the door, locking means for locking the door in its closed position, of a shaft carrying'a lever arm' adapted to operate said locking means, 15 a cataract-cylinder containing a piston, a shaft carrying a bushing having projections revoluble on said cylinder, and a ley ver connected with the piston and with the latter shaft, saidlever arm being rotated by 20 said bushing when-said iston 1s raised.

In testimony whereof, aix my signature in the presence of `two Witnesses.

GUSTAV DE GRAHL.

Witnesses:v

FRIEDRICH ROKAHR, WOLDEMAR HAUPT. 

